madshi.net

Davita · Joined: 13 Sep 2005 Posts: 106

Hello

Again I need your support guys, thanks in advance smile

1) I'm using heavilly madshi's IPC in my project. Everything worked fine until now. Here's my problem. When I want to send a message and get a reply as string, the program throws access violation exceptions. The problem is that I don't know length of replied string while calling IPCSendMessage. I tried increasing AnswerLen to 1024 and more(reply string is much less then 1024 bytes, but still, don't know the exact length), but doesn't help. any solutions? sad

here's the code

var Msg, TempRules: string;
begin
SendIpcMessage(IPC_CHANNEL, PChar(Msg), Length(Msg) + 1,
@TempRules, sizeof(string) {what have i to put here?}, INFINITE, False);
end;

2) Will I get some speedups(over delphi version) if I rewrite the hook dll to C? I have C++ compiler 11 installed.

dcsoft · Posted: Mon Feb 23, 2009 4:40 am Post subject: Don't use string

It's easier to use the fixed character buffer for the answer:

Davita · Joined: 13 Sep 2005 Posts: 106

wow. You can't imagine how you helped me. many many thanks smile

what about second question? very happy

dcsoft · Posted: Mon Feb 23, 2009 4:08 pm Post subject:

Glad it worked for you! I'm no Delphi expert by any means but recently had to struggle through this same issue. wink

So I've plenty of experience using MadCodeHook and Visual C++. I don't know for sure, but I really don't think that performance is that much different than in Delphi. Both probably spend most of their time in the Windows system calls and not in the VC or Delphi code itself.

Theoretically you might get smaller hook DLL's in Delphi since both share the same runtime library, and you don't need the VC++ one in addition to the Delphi one linked in with the madcodehook library.

Many years ago I was good at Turbo Pascal, but now all these @, PChar, etc. is foreign to me and I'm much more productive in VC++, that's why I use MadCodeHook and VC++, not because of any performance increase.

Cheers,
David

Davita · Joined: 13 Sep 2005 Posts: 106

Thank you very much for your help smile

madshi · Site Admin Joined: 21 Mar 2004 Posts: 5908

Delphi and MSVC++ don't differ much in performance. So using MSVC++ instead of Delphi will most probably not make any difference. However, the Delphi version you're using could make a difference. Personally, I'm still using Delphi 7 for hook dlls, cause that has proven to be a very stable environment to create hook dlls.